DOWEL 4S8537 - Caterpillar

Intake and exhaust valve stems are to be coated with engine oil prior to installation in the cylinder head. Intake and exhaust valve tips are to be coated with 8T2988 Camshaft Break In Lubricant (only after assembly of the retainer).(1) Exhaust valve.(2) Intake valve.(3) 6I2307 Spring for exhaust valve.Free length ... 81.0 mm (3.19 in)Assembled length ... 70.8 mm (2.79 in)Load at assembled length ... 612 31 N (140 7 lb)Minimum operating length ... 59 mm (2.3 in)Load at minimum operating length ... 1325 66 N (300 15 lb)(4) 7C4273 Spring for intake valve.Free length ... 71.0 mm (2.80 in)Assembled length ... 65.86 mm (2.593 in)Load at assembled length ... 217 22 N (49 5 lb)Minimum operating length ... 50.7 mm (2.00 in)Load at minimum operating length ... 858 43 N (190 10 lb)(5) Height to top of valve guides ... 23.00 0.50 mm (0.906 0.020 in)Install valve guide with 12.065 mm (0.4750 in) diameter on spring side of the head.Assemble with seal seated against top of valve guide.(6) Diameter of valve stems (new). ... 8.000 0.008 mm (0.3150 0.0003 in)"Use again" minimum diameter of valve stems ... 7.965 mm (0.3136 in)Bore in valve guides with guides installed in head ... 8.072 .013 mm (0.3178 0.0005 in)"Use again" maximum bore in valve guides with guides installed in head ... 8.080 mm (0.3181 in)(7) Diameter of valve head: Intake valve ... 47.00 0.13 mm (1.850 0.005 in)Exhaust valve ... 40.00 0.13 mm (1.575 0.005 in)(8) Angle of valve faces:Intake valve ... 29 3/4 1/4 degreesExhaust valve ... 45 1/4 degrees (9) Diameter of valve seat inserts: Intake valve ... 50.000 0.013 mm (1.9685 0.0005 in)Exhaust valve ... 43.000 0.013 mm (1.6929 0.0005 in)Bore in head for valve seat insert:Intake valve ... 49.931 0.013 mm (1.9658 0.0005 in)Exhaust valve ... 42.931 0.013 mm (1.6902 0.0005 in)Valve seat insert must be shrunk by reduced temperature before installing in head.(10) Angle of valve seat inserts:Intake valve ... 30 1/4 1 degreesExhaust valve ... 451/2 1 degrees(11) Depth of bore in head for valve seat insert ... 10.00 0.13 mm (0.394 0.005 in)(12) Outside diameter of the seating face of the valve seat insert: Intake valve ... 44.029 0.085 mm (1.733 0.0033 in)Exhaust valve ... 38.077 0.046 mm (1.500 0.0018 in) Do not reuse or recondition valve seat inserts if the outside diameter is greater than specified.(13) "Use again" thickness of valve lip: Intake valve ... 1.80 mm (0.071 in)Exhaust valve ... 1.50 mm (0.059 in)(14) Distance from head of valve to the cylinder head face (valve closed): Exhaust valve Maximum permissible ... 2.85 mm (0.112 in)Minimum permissible ... 2.67 mm (0.105 in) Intake valveMaximum permissible ... 2.05 mm (0.081 in)Minimum permissible ... 1.13 mm (0.044 in) For further information refer to: Guidelines for Reusable Parts and